(1) Copyright does not exist in a work unless the requirements of section 18 or section 19 or section 20 of this Act are satisfied in respect of that work.
(2) Subsection (1) of this section does not apply to copyright that exists by virtue of section 26 or section 28 of this Act.
(3) If the requirements of section 18 or section 19 or section 20 or section 26 or section 28 of this Act are once satisfied in respect of a work, copyright in that work does not cease to exist if any change occurs in any of the circumstances by reason of which those requirements were satisfied.
(4) For the avoidance of doubt, it is hereby declared that where any other provision of this Act imposes requirements, in addition to the requirements of section 18 or section 19 or section 20 of this Act, that must be satisfied for copyright to exist in a work, copyright does not exist in a work unless the requirements of that provision and the requirements of section 18 or section 19 or section 20 of this Act are satisfied in respect of that work.
Compare: Copyright, Designs and Patents Act 1988, s 153 (UK)